Everyone from different factions from Halo, Starcraft, and C&C Tiberium are ended up on Earth in 0079 U.C. where the conflict between Earth Federation and the Principality of Zeon occurred, it's up to the Allies to work together to try survive this alternate reality Earth that have started the conflict of what is known as the One Year War, and they would facing their common enemies such as the Banished, Neo Nod, and the Black Order of Amon that consider them the threat to everyone in this alternate universe.